Lock shackle



FIG. 1 is a top plan view of a lock shackle showing my new design;

FIG. 2 is a side elevational view thereof, the other side elevational being a mirror image thereof;

FIG. 3 is front elevational view thereof, the rear elevational being a mirror image thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines are for illustrative purpose and form no part of the claimed design. 

The ornamental design for a lock shackle, as shown and described. 